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A modeling study on a direct expansion based air conditioner having a two-sectioned cooling coil

Author

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  • Yang, Liu
  • Weng, Wenbing
  • Deng, Shiming

Abstract

In small- to medium- scale buildings such as residences and retails located in hot and humid regions, direct expansion based air conditioning systems are widely used for the control of indoor thermal environment. However, to simultaneously control indoor air temperature and humidity using direct expansion air conditioning systems, additional and costly provisions/installation spaces are usually required. Therefore, to address the inadequacies encountered in previous related studies, based on multi-evaporator technology, a novel direct expansion based air conditioning system having a two-sectioned evaporator or cooling coil (TS-DXAC) was proposed to provide variable dehumidification capacity and improved indoor air distribution. In this paper, the development of a steady-state physics-based mathematical model for the novel TS-DXAC system is presented. The model was developed by referring to the existing sub-models for the key system components, such as a compressor, a condenser and an evaporator, which were currently available in open literature. The developed model was experimentally validated using a purposely established prototype experimental TS-DXAC system, with the differences between experimental and predicted results of less than 6%. Using the validated TS-DXAC model, a follow-up modeling study was carried out on optimizing the sizes of the two sections. The simulation results suggested that a lower surface area ratio for the two sections (Rs) can lead to a larger variation ranges of both output total cooling load (TCC) and equipment sensible heat ratio (E SHR). For example, at the inlet state of 26 °C and 50% relative humidity, when Rs was altered from 1:1 to 1:3, the variation range for TCC was increased by 33%, and that for E SHR by 51%, which was beneficial to better dehumidification.

Suggested Citation

  • Yang, Liu & Weng, Wenbing & Deng, Shiming, 2020. "A modeling study on a direct expansion based air conditioner having a two-sectioned cooling coil," Applied Energy, Elsevier, vol. 278(C).
    • Handle: RePEc:eee:appene:v:278:y:2020:i:c:s0306261920311855
    DOI: 10.1016/j.apenergy.2020.115688
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    References listed on IDEAS

    as
    1. Chen, Wenjing & Chan, Ming-yin & Weng, Wenbing & Yan, Huaxia & Deng, Shiming, 2018. "An experimental study on the operational characteristics of a direct expansion based enhanced dehumidification air conditioning system," Applied Energy, Elsevier, vol. 225(C), pages 922-933.
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    3. Zhang, Zi-Yang & Cao, Xiang & Yang, Zhi & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Modeling and experimental investigation of an advanced direct-expansion outdoor air dehumidification system," Applied Energy, Elsevier, vol. 242(C), pages 1600-1612.
    4. Fan, Hongming & Shao, Shuangquan & Tian, Changqing, 2014. "Performance investigation on a multi-unit heat pump for simultaneous temperature and humidity control," Applied Energy, Elsevier, vol. 113(C), pages 883-890.
    5. Xiao, Fu & Ge, Gaoming & Niu, Xiaofeng, 2011. "Control performance of a dedicated outdoor air system adopting liquid desiccant dehumidification," Applied Energy, Elsevier, vol. 88(1), pages 143-149, January.
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    Cited by:

    1. Liu, Zichu & Quan, Zhenhua & Zhang, Nan & Wang, Yubo & Yang, Mingguang & Zhao, Yaohua, 2023. "Energy and exergy analysis of a novel direct-expansion ice thermal storage system based on three-fluid heat exchanger module," Applied Energy, Elsevier, vol. 330(PB).
    2. Homod, Raad Z. & Togun, Hussein & Ateeq, Adnan A. & Al-Mousawi, Fadhel Noraldeen & Yaseen, Zaher Mundher & Al-Kouz, Wael & Hussein, Ahmed Kadhim & Alawi, Omer A. & Goodarzi, Marjan & Ahmadi, Goodarz, 2022. "An innovative clustering technique to generate hybrid modeling of cooling coils for energy analysis: A case study for control performance in HVAC systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 166(C).

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